氧化铝——氧化锆纳米复合颗粒的制备及表征

Preparation and characterization of alumina-zirconia nanoparticles

在水/辛烷基苯酚聚氧乙烯醚(Triton X-100)/正丁醇/环已烷组成的微乳液体系中,制备并表征了氧化铝-氧化锆纳米复合颗粒.用动态光散射法研究了温度、水与表面活性剂的物质的量比、反应物的浓度等反应条件对Al(OH)3-Zr(OH)4颗粒平均粒径以及粒度分布的影响.分别用透射电镜、X射线衍射、红外以及热分析表征60℃真空干燥和500,1200℃热处理后的粉末,表明60℃真空干燥后,粉末以无定形为主;500℃时粉末粒径为5nm左右,主要是t-ZrO2,Al2O3以固熔体形式存在; 1200℃时粉末粒径为200 nm左右,是t-ZrO2,m-ZrO2,α-Al2O3共存.

Al2O3-ZrO2 nanoparticles were obtained in the microemulsion of water/Triton X-100/n-butanol /cyclohexane. A variety of conditions for the preparation of Al（OH）3-Zr（OH）4 nanoparticles were investigated. The sizes of the nanoparticles were measured by dynamic light scattering and he results showed that the reaction temperature, the mole ratio of water to surfactant（Rw）, and the concentration of the reactants are the predominant factors in controlling the particle size and distribution of Al（OH）3-Zr（OH）4. The phase transformation, structure and morphology of Al2O3- ZrO2 nanoparticles were characterized by TEM, XRD, IR and TG, respectively. The results show that the nanoparticles calcined in vacuum at 60℃ are amorphous, and t-ZrO2 appears as a predominant phase upon calcining the nanoparticles at 500℃; further heating the nanoparticles at 1 200℃ leads to t-ZrO2, m-ZrO2 and α-Al2O3. TEM show that the average particle size is 5 nm and 200 nm at 500, 1 200℃, respectively.